Finishing or guard ring for electric conduits.



.No. 837,654. PATENTED 13110.4, 1906.

' A. I. APPLETON.

FINISHING OR GUARD RING FOR ELECTRIC GONDUITS.

. APPLICATION FILED JUNE 26. 1905.

UNITED STATES PATENT orrrcn.

ALBERT I. APPLETON, OF CHICAGO, ILLINOIS.

FINISHING OR GUARD RING FOR ELECTRIC CONDUITS.

1'0 all whom, it n'mg concern:

Be it known that I, ALBERT I. APPLETON, a citizen of the United States, residing at Chicage, in the county of (look andState '01 Illinois, have invented certain new and uscful Improvements in Finishing or Guard Rings for Electric Conduits, of which the following is a specification.

In installing insulated electrical wires and cables it is customary to inclose them at various points within pipes or conduits, and as the ends of these conduits frequently present sharp or rough edges it is necessary to protect the insulation upon the wires from the abrasion of said shar edges.

It is the object of t 118 invention,- therefore, to provide an improved means for affording such protection to insulated wires where they enter or emerge from. the conduit, thereby lessening the danger of grounding and shortcircuiting the current traversing said wires.

In the accompanying drawings, Figure 1 is a sectional view of a conduit with insulated wires therein, showing the finishing or guard ring of this invention upon the outer end of saidconduit. Fig.2 is a sectional View of a nut, and Fig. 3 a similar view of a short piece of tubing,which nut and tubing enter into the construction of said finishing or guard rin Iii the drawings, 1 refers to a portion of an inclosing casing-for instance, a switch-b ox into which the insulated wires 2 are conducted through the pipe 3, one end of said pipe extending through an opening 4 in sa1d switch-box. The pipe 3 is locked in position with relation to the box 1 by means of two nuts 5 and 6, turned upon screw-threads 7,

formed upon the outer surface of the pipe 3 near the end thereof. The nut 5 lies upon the rear side of the box '1, while the nut 6 is turned upon the threads 7 in contact with the front side of said box. The guard-ring 8 for supporting the wires above the sharp edges at the end of the pipe 3 in this instance is formed from a short piece of tubing 9, Fig.

Specification of Letters Patent.

Application filed June 26. 1905. Serial No. 267.035.

Patented Dec. 4, 1906.

3, pressed into the outer end of the o ening in the nut 6 in ring form, as will be ereinafter more fully described. This tubular piece 9 may be formed of brass or other ductile metal. The inner periphery of the tube is beveled at one end, as shown at 10, to faof which it is pressed into the nut 6. By means of suitable dies said tube is set within the opening in the nut 6 at the outer end of said nut and is given ring form, the inner diameter of the ring bein somewhat less than the inner diameter of t e tube 3. The ring is set firmly within the end of the nut 6, its inner sidebeing seated securelywithin the screw-threads of said nut and its outer edge turned back against the face of the nut. The

threads of the nut is so secure that the ring is held rigidly in position upon the nut, While the outer side of the ring is forced ti htly appears to be integral with said nut.

I claim as my invention 1. A finishing or guard ring for electric conduits comprising a nut threaded to have a screw-thread engagement with the end of the eonduit,and an annularmember engaging the screw-threads within said nut and secured to said nut by means of said engagement, said member providing a smooth rounded bearing-surface for an electric conductor. I

2. A finishing or guard device for electric conduits comprising a nut threaded to have a conduit, and a rass ring one edge of which engages the screwthre'ads within the central aperture of said nut, the other edge of said ring being bent over upon the outer end of said nut.

ALBERT I. APPLETON.

Witnesses:

L. L. MILLER, GEORGE L. CmNDAnL.

engagement of the ring 8 with the screw against the face of the nut and when finished screw-thread engagement with the end of the cilitate its engagement with a die by means 

